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Author Topic: 750K 77 (K7) petcock gasket dimensions  (Read 972 times)

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Offline Erny

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750K 77 (K7) petcock gasket dimensions
« on: May 07, 2018, 05:00:47 AM »
Can someone please provide dimesions of gasket beween petcock and tank? Also if shape is flat rubber or O ring?

I can make it manufactured locally but need to know dimensions

My estimation would be 14.5 x9 x2 mm, flat.

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CB750K K7 USA model (1977)
CB550K1 USA model (1975)

Offline madmtnmotors

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Re: 750K 77 (K7) petcock gasket dimensions
« Reply #1 on: May 07, 2018, 06:38:46 AM »
Are you replacing the filter too? The replacement filter comes with a new seal, Honda P/N 16952-388-015.
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Offline Erny

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Re: 750K 77 (K7) petcock gasket dimensions
« Reply #2 on: May 07, 2018, 07:00:38 AM »
I do not plan to replace filter. And buying whole kit for 40usd (incl shipping to Europe) is simply too much for gasket only
« Last Edit: May 07, 2018, 07:08:39 AM by Erny »
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CB750K K7 USA model (1977)
CB550K1 USA model (1975)

Offline Phinn

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Re: 750K 77 (K7) petcock gasket dimensions
« Reply #3 on: May 07, 2018, 02:08:27 PM »
It's definitely flat. I had to cut a larger one to make one that fit.
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Offline Erny

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Re: 750K 77 (K7) petcock gasket dimensions
« Reply #4 on: May 07, 2018, 11:17:13 PM »
And dimensions? Thickness?
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CB750K K7 USA model (1977)
CB550K1 USA model (1975)

Offline Phinn

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Re: 750K 77 (K7) petcock gasket dimensions
« Reply #5 on: May 08, 2018, 08:19:12 AM »
Quote from: Erny on May 07, 2018, 11:17:13 PM
And dimensions? Thickness?

I didn’t measure it. I just cut a hardware store faucet washer down to fit inside the petcock’s threads. The inner hole was pretty large, leaving the remaining surface no more than 2mm wide. The thickness (which was probably SAE) was pretty close to 2mm, maybe 1.5mm. It works fine.
« Last Edit: May 08, 2018, 08:21:44 AM by Phinn »
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1978 CB750K -- "Mouse," a former basket case, resurrected

Offline johans

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Re: 750K 77 (K7) petcock gasket dimensions
« Reply #6 on: May 08, 2018, 08:53:24 AM »
I'm getting a new original petcock for a 78k tank this week, i can measure it for you if u can wait a few days.
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Offline Erny

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Re: 750K 77 (K7) petcock gasket dimensions
« Reply #7 on: May 08, 2018, 09:03:05 AM »
Sure, it will help! Thanks
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CB750K K7 USA model (1977)
CB550K1 USA model (1975)
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